This is a wall mount (or just a protective cover if you don't mount it) for the Simonis X-1 pool table "brush", which is used to clean pool/billiards tables.

The X-1 has a felt pad that collects a lot of chalk, dirt, and other things when cleaning a pool table, so I wanted to have a way to hang it where the back was covered, preventing it from marking up my wall.

Edit 10/15/2018: I added a second version that has two screw holes. The GRK Cabinet Screws are a low-profile screw with a washer head that hold this mount very well, and can be used in studs or with a drywall anchor. The countersunk holes are designed for these screws to keep the screw head flush and still provide plenty of holding power.